RESIDENT EVIL 6 The Mercenary No Mercy || Ada Default The Rooftop Mission 

This is one of the series of Resident Evil 6 Mercenary in No Mercy difficulty in which the player has to survive within the time limit and kill enemies as many as possible. Players can find a time bonus to increase the time limit to stay longer. The maximum kill per level is 300 kills. When a player kills multiplies enemies there will be combos. And when a player doesn't kill more enemies for a short period of time. The combo will be reset.